Numerical simulation of a high-speed fragment penetrating a liquid tank

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 144-150.

XU Sibo，MENG Zifei，LIU Wentao，CAO Xueyan

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Abstract

The penetration of high speed fragments has been concerned for a long time which always occurs during the process of near-field underwater explosions. Due to the randomness of explosions and expensive costs of the explosion tests, it’s important to build a numerical model to simulate it exactly. In the present paper, the coupled eulerian-lagrangian(CEL) method was applied to simulate the process of a high speed fragment impacting on a liquid tank. Furthermore, the effects of the fragment velocity and liquid quantity on the pressure and cavity evolution were discussed. The numerical results, including the velocity decay vs. time of fragment, cavity evolution and pressure at different points of the fluid under different impact velocities, are quite consistent with the experimental tests results. If the trajectory is far away from the surface, the velocity decay vs. time is not influenced by the liquid quantity. As the distance from the free liquid surface decreases, the asymmetrical difference of incident trajectory will increase from 20% to 48%. The deformation on the entry wall of a tube is in direct proportion to the initial velocity of fragments, while the deformation on the exit wall has a nonlinear increase.

Key words

high speed fragment / fuel tank / CEL / penetration / expansion of the cavity

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XU Sibo，MENG Zifei，LIU Wentao，CAO Xueyan. Numerical simulation of a high-speed fragment penetrating a liquid tank[J]. Journal of Vibration and Shock, 2019, 38(6): 144-150

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